Prepare release v1.10 (#343)

* Prepare release v1.10

* Cleanup

versions/1/changelog.yml

@@ -2,11 +2,8 @@
 ## This file documents changes in the package specification. It is NOT a package specification file.
 ## Newer entries go at the bottom.
 ##
-- version: 1.9.1-next
+- version: 1.10
   changes:
-    - description: Prepare for next version
-      type: enhancement
-      link: https://github.com/elastic/package-spec/pull/337
     - description: Define beta features in spec
       type: enhancement
       link: https://github.com/elastic/package-spec/pull/341
@@ -15,9 +12,6 @@
       link: https://github.com/elastic/package-spec/pull/328
 - version: 1.9.0
   changes:
-  - description: Prepare for next version
-    type: enhancement
-    link: https://github.com/elastic/package-spec/pull/330
   - description: Add custom agent tests spec
     type: enhancement
     link: https://github.com/elastic/package-spec/pull/335